Writing conclusion paragraphs in a science lab report
A good Conclusion takes you back to the larger purpose of the lab: to learn something about the scientific concept, the primary reason for doing the lab. The Conclusion is your opportunity to show your lab instructor what you learned by doing lab and writing the lab report.
Writing a conclusion for a lab report - Tenmilesquare

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Writing the Conclusions Section of a Lab Report -
What you have learned is indicated in the report, especially the Introduction and the Conclusion. You can improve the Introduction by (1) expressing more clearly the scientific concept you are supposed to be learning about and (2) showing that you have a good understanding of the scientific concept (see treatment of Introduction above). In addition, check your designation of the purpose of the lab in the Introduction. Be sure that it explicitly and clearly makes the connection between the objectives of the procedure and the scientific concept.
View Lab Report - Lab 546 Conclusion from CHEM 1442 at UT Arlington
The other key part of the report you should review is the Conclusion. This is where you make your strongest case for what you learned in doing the lab. You may be able to improve the Conclusion by rewriting the statement of what you have learned, rewording it so that it is clearer to the reader. You could also enhance the rest of the Conclusion by adding more details concerning what you have learned (see treatment of Conclusion above). Remember, your job is to convince your reader that you have achieved this aim, and this is the section of the report in which you do that directly.

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A cornerstone of scientific experimentation is that an experiment can be repeated by other investigators and the same results achieved. In order to make this possible, a written record of the experiment must be kept including the analysis of the data, observations, inferences and/or conclusions reached. Anyone reading your lab report should be able to reconstruct your experiment precisely in its entirety.3. Follow the order for writing lab reports the LabWrite way: Methods, Results, Introduction, Discussion, Conclusion, Abstract, Title, and References.Your report will have one or more complete sections—the section or sections assigned to you—but it will also have very brief summaries for each of the other sections of the lab report. So your lab report will have all the sections—Introduction, Methods, Results, Discussion, Conclusion—but with only a sentence or two in the sections that were not assigned.If you are asked to write only an abstract of your lab, follow the directions for each lab report section on this page starting with Methods, but for each section, write only the one-sentence option (not the complete section option). Then put your sentences together in a block paragraph in the proper order: Introduction, Methods, Results, Discussion, and Conclusion.